THERMO-CHEMICAL REGENERATION WITH PRELIMINARY OXIDANT HEATING Russian patent published in 2019 - IPC C01B3/34 

FIELD: technological processes.

SUBSTANCE: invention can be used in metallurgical, glass-melting, incineration and cement-burning furnaces. Heat recovery process consists of two cycles – heat removal cycle and reforming cycle, performed alternately in two and more regenerators filled with nozzles. During the nozzle removal cycle, heat of flue gas with high temperature is extracted and stored in the first regenerator, which is supplied from the furnace through the given regenerator. Then, in the reforming cycle, part of the cooled flue gas that comes out of the first regenerator is supplied to the other regenerator and mixed with the fuel flow for reforming. In the second regenerator, thermal dissociation of the mixture from the cooled flue gas and fuel is carried out on the heated nozzle. Endothermic reaction results in formation of fuel products H₂, C₂H₂, C₂H₄ and soot, and regenerator nozzle is cooled. Mixture of gaseous products comes out of the second regenerator into the furnace, where it is burnt under the effect of the oxidising agent with extraction of heat energy used for heating or melting material in the furnace. After a while two regenerators are changed by cycles, i.e. regenerator used in withdrawal cycle is switched to reforming cycle, and regenerator, which was used in reforming cycle, is switched to retraction cycle. Before the cycles are changed, the reforming fuel flow is stopped, and the recycled flue gas flow is continued until the part or the whole volume of the residual fuel for reforming and synthesis gas is not blown from the regenerator and burnt in the furnace.

EFFECT: disclosed invention provides utilization of waste flue gas energy and higher efficiency of furnace operation.

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